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copy.go
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copy.go
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// Package gocmdcopy copies with the given expander from the given directory into the given directory.
package gocmdcopy
import (
"fmt"
"path/filepath"
"golang.org/x/xerrors"
"github.com/otiai10/copy"
"aduu.dev/utils/expander"
)
var (
// ErrNotAbsolute means that the path wasn't absolute as it was supposed to be.
ErrNotAbsolute = fmt.Errorf("path is not absolute")
)
// Copy copies from to to. Errors out if to exists already. Expands from and to with the given expander.
func Copy(exp expander.Expander, from string, to string) (err error) {
defer func() {
if err != nil {
err = xerrors.Errorf("copying failed from %s to %s: %w", from, to, err)
}
}()
newFrom, err := exp.ExpandPath(from)
if err != nil {
if xerrors.Is(err, expander.ErrNoPrefix) {
// Do nothing.
} else {
return
}
} else {
from = newFrom
}
newTo, err := exp.ExpandPath(to)
if err != nil {
if xerrors.Is(err, expander.ErrNoPrefix) {
// Do nothing.
} else {
return
}
} else {
to = newTo
}
if !filepath.IsAbs(from) {
return ErrNotAbsolute
}
if !filepath.IsAbs(to) {
return ErrNotAbsolute
}
from, err = filepath.EvalSymlinks(from)
if err != nil {
return
}
to, err = filepath.EvalSymlinks(to)
if err != nil {
return
}
if err = copy.Copy(from, to); err != nil {
return err
}
return nil
}